DOCSLIB.ORG

DBF´S Reparieren Leicht Gemacht Von Wolfgang Pasler Und Hans-Peter Grözinger (Das Schwabenteam) Stand 12.01.04Seite 1/8

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
DBF´S Reparieren Leicht Gemacht Von Wolfgang Pasler Und Hans-Peter Grözinger (Das Schwabenteam) Stand 12.01.04Seite 1/8 DBF´s reparieren leicht gemacht von Wolfgang Pasler und Hans-Peter Grözinger (das Schwabenteam) Stand 12.01.04Seite 1/8 Das Schwaben-Team Wer sind wir: -Wolfgang Pasler - Pasler Software Programmiersprachen: -C / C++ seit 1988 -Clipper seit 1989 -Visual-FoxPro 3.0 - 8.0 seit 1996 Spezialgebiete: -Objektorientierung und Business Objekte -Kaufmännische Anwendungen -über 14 Jahre Erfahrung in der Entwicklung kaufmännischer Anwendungen für die Schmuckindustrie -Seit 1 Jahr Linux im Einsatz von heterogenen Netzwerken. -Hans-Peter Grözinger - Ingenieurbüro Grözinger Programmiersprachen: -dBase III / IV / 5.0 seit 1987 -FoxPro 2.6 seit 1994 -Visual-FoxPro 3.0 - 8.0 seit 1996 -MS-C/C++ 7.0 seit 1990 -Visual C/C++ 5.0/6.0 seit 1996 Spezialgebiete: -C/C++ und VFP im technischen Umfeld -Datenkonvertierung Beide treiben sich regelmäßig im dFPUG und MS-Foxpro-Forum herum. DBF´s reparieren leicht gemacht von Wolfgang Pasler und Hans-Peter Grözinger (das Schwabenteam) Stand 12.01.04Seite 2/8 DBF-Struktur Folgende Informationen wurden der VFP7 und VFP8-Hilfe entnommen und zum Teil ergänzt: Struktur des Vorspanndatensatzes einer Tabelle Versatz in BytesBeschreibung Dateityp für dBASE IV Bit 0 - 2:Versionsnummer 3:Memodatei vorhanden 4 - 6:SQL-Tabelle vorhanden 7:DBT-Flag Dateityp für Visual Foxpro Bit 0 - 1:Versionsnummer 2:Memodatei vorhanden 4:Datenbank-Container vorhanden 7:DBC (mit MEMO und Indexdateien) 0 0x02 FoxBASE/dBASE II 0x03 FoxBASE+/dBASE III PLUS, kein Memo 0x04 dBASE IV ohne Memo 0x05 dBASE V ohne Memo 0x30 Visual FoxPro 0x31 Visual FoxPro, autoinkrement aktiviert (VFP 8.0) 0x43 dBASE IV SQL-Tabellendateien, kein Memo 0x63 dBASE IV SQL-Systemdateien, kein Memo 0x83 FoxBASE+/dBASE III PLUS, mit Memo 0x8B dBASE IV mit Memo 0x8E dBASE IV mit SQL-Tabelle 0xCB dBASE IV SQL-Tabellendateien, mit Memo 0xF5 FoxPro 2.x (oder früher) mit Memo 0xFB FoxBASE 1 – 3Letzte Aktualisierung (JJMMTT) 4 – 7Anzahl der Datensätze in der Datei 8 – 9Position des ersten Daten-Datensatzes (hiermit kann man die Anzahl der Felder bestimmen) 10 – 11Länge eines Daten-Datensatzes (einschließlich Löschattribut) 12 – 27Reserviert. Tabellenattribute 0x01 Datei hat eine strukturierte CDX 0x02 Datei hat ein Memofeld 28 0x04 Datei ist eine Datenbank (DBC) Beachten Sie, dass dieses Byte eine Summe aus oben genannten Werten enthalten kann. 0x03 gibt z. B. an, dass die Datei eine strukturierte .CDX-Datei und ein Memofeld hat. 29Code-Seitenmarkierung (siehe Programm CPZERO.PRG) 30 – 31Reserviert, enthält 0x00 Feld-Teildatensätze 32 - n Die Anzahl der Felder legt die Anzahl an Feld-Teildatensätzen fest. Für jedes Feld der Tabelle gibt es einen Feld-Teildatensatz. N+1Vorspanndatensatz-Endzeichen (0x0D) Ein 263 Bytes umfassender Bereich, der die Rückverweisinformationen, also den relativen Pfad zur zugehörigen Datenbank (.DBC), enthält. Ist das erste Byte 0x00, ist die Tabelle nicht mit N+2 to n+264 einer Datenbank verbunden. Datenbankdateien weisen an dieser Position deshalb immer den Wert 0x00 auf. 1 Die Daten in der Datendatei beginnen an der Position, die durch die Bytes 8 bis 9 des Vorspanndatensatzes angegeben ist. Daten-Datensätze beginnen mit einem Byte, das das Löschattribut setzt. Ist dieses Byte der ASCII- Wert für Leerzeichen (0x20), wird der Datensatz nicht gelöscht. Ist das erste Byte ein Sternchen (0x2A), wird der DBF´s reparieren leicht gemacht von Wolfgang Pasler und Hans-Peter Grözinger (das Schwabenteam) Stand 12.01.04Seite 3/8 Datensatz gelöscht. Die Daten der Felder, die in den Feld-Teildatensätzen genannt sind, folgen auf das Löschattribut. Struktur der Feld-Teildatensätze Versatz in BytesBeschreibung Feldname (maximal 10 Zeichen, bei weniger als 10 Zeichen wird der Name mit Nullzeichen 0 – 10 (0x00) aufgefüllt) Feldtyp: C – Zeichen Y – Währung N – Numerisch F – Gleitkomma D – Datum T – DatumZeit 11 B – Double I – Integer L – Logisch M – Memo G – Objekt C – Zeichen (binär) M – Memo (binär) P – Bild 12 – 15Adressenversatz des Feldes im Datensatz 16Feldlänge (in Bytes) 17Anzahl der Dezimalstellen Feldattribute 0x01 Systemspalte (für Benutzer nicht sichtbar) 0x02 Spalte kann Nullwerte enthalten 18 0x04 Binärspalte (nur für CHAR und MEMO) 0x06 (0x02+0x04) Wenn ein Feld NULL und binär ist (Integer, Währung und Zeichen/Memo- Felder) (VFP 8.0) 0x0C Spalte ist autoinkrementierend (VFP 8.0) 19 - 22Wert des nächsten Autoinkrementwertes (VFP 8.0) 23Stufenwert des Autoinkrementwertes (VFP 8.0) 24 – 32Reserviert. Weiter Info´s zur DBF-Struktur gibt´s hier: http://www.klaban.torun.pl/prog/pg2xbase/contrib/dbf-format.html http://www.e-bachmann.dk/docs/xbase.htm DBF´s reparieren leicht gemacht von Wolfgang Pasler und Hans-Peter Grözinger (das Schwabenteam) Stand 12.01.04Seite 4/8 Kurzübersicht der wichtigsten Elemente des DBF-Headers: Erste "Zeile" (die ersten 32 Bytes) 012345678910111213141516171819202122232425262728293031 © g ◙ • ╠ ☺ A ☺ F ☺ ☼ DateitypDatumDatensätzeOffsetSatzlängeAttCP Feldbeschreibungszeile 012345678910111213141516171819202122232425262728293031 CNRBIGBAGCü-; ● FeldnameTypFeldoffsetLenDecAtt DBF´s reparieren leicht gemacht von Wolfgang Pasler und Hans-Peter Grözinger (das Schwabenteam) Stand 12.01.04Seite 5/8 FOXFIX Info zu Foxfix gibt´s hier: http://www.xitech-europe.co.uk/ FoxFix erlaubt das Wiederherstellen von beschädigten Datenbanken. Dies kann für den Anwender völlig transparent erfolgen. Man kann die Fix-Funktionen in seinen Error-Handler einbinden und somit sofort beim Auftreten eines Fehlers die Datenbank korrigieren lassen. FoxFix ist die einzige Möglichkeit, eine Datenrettungs-Engine ohne weitere Kosten in die eigene Applikation einzubinden und weiterzugeben! FoxFix kann sowohl einfache Dateifehler beheben, als auch komplett gelöschte Dateien an Hand der Indexdatei wiederherstellen. Bei der Rekonstruktion aus Indexdateien werden alle Felder rekonstruiert, auf denen zum Zeitpunkt des Fehlers ein Index lag. Berücksichtigt werden auch gelöschte Indizes, die nur über ein REINDEX versteckt wurden. Vor allem für Programmierer gibt es noch einige nützliche Funktionen. So kann FoxFix aus einem SPR wieder eine Maskendatei (SCX) erstellen, die dann in gewohnter Art und Weise mit MODIFY SCREEN... bearbeitet werden kann. Das Selbe funktioniert natürlich auch mit Menüdateien. Weiters kann aus einer Applikation (APP) wieder ein Projekt regeneriert werden. Dabei wird die komplette PJX- Datei mit allen Pfaden, usw. wieder erstellt. FoxFix kann jedoch keinen Source - Code aus APP - Files erstellen. Dies erledigt das Tool "ReFox" vom gleichen Hersteller. FoxFix - Funktionsumfang: SPR to SCX Masken aus Source- Codes erstellen MPR to MNX Menüs aus Source- Codes erstellen APP to PJX Projekte aus Applikationen erstellen CDX to DBF Datenbanken aus Indizes wiedererstellen CDX to PRG Erstellt den Source- Code zum Indizieren einer Datei unter Verwendung der momentanen Indizes DBF - Repair Repariert unlesbare Datenbanken Feststellung von Header-Korruption in der CDX Indexdatei. Eine DLL, in welche die Aufspürung von Headern in der Runtime eingeschlossen werden kann. Diese DLL hat auch einen "Tarnkappenmodus"; das bedeutet, dass FoxFix automatisch auf jeder offenen Tabelle angewendet werden kann, ohne dass hierzu ein kodierter Funktionsaufruf nötig wird. Live-Demo DBF´s reparieren leicht gemacht von Wolfgang Pasler und Hans-Peter Grözinger (das Schwabenteam) Stand 12.01.04Seite 6/8 DBF´s mittels Binär/Hexeditor bearbeiten/reparieren Der Editor TSE Pro v4.0 von http://www.semware.com/ bietet die für eine Reparatur von DBF- Dateien folgende spezielle Optionen: -Binär-Modus -Hex-Ansicht -DBF-Makro Live-Demo: -Reparatur von defekten Header (Binärmodus) aus einer Sicherung - REPOS -Reparatur von Datenfehlern (DBF-Makro) mit Daten aus einer Sicherung - WARENBGSCHEIN -Anzahl der Datensätze im Kopf korrigieren (DBF-Makro) - RECHTE -Spaltenweise Reparatur (Stichwort lange Feldnamen) - REKOPF - Feld Lieferstatus Kleine nützliche Tools: -dBStruct (Struktur von DBF´s anzeigen) -dBSplit (DBF´s in kleine Stückchen teilen). DBF´s reparieren leicht gemacht von Wolfgang Pasler und Hans-Peter Grözinger (das Schwabenteam) Stand 12.01.04Seite 7/8 Weitere Möglichkeiten: -Eingebaute Reparaturmöglichkeiten von VFP 7/8 (Checken beim Öffnen) Einfach in der VFP-Hilfe mal über SET TABLEVALIDATE TO (0 - 3) nachlesen. Verweiß auf Reparaturtools (alle von mir ungeprüft, gibt´s zum Runterladen von ): -FoxWiki: http://fox.wikis.com/wc.dll?Wiki~TableCorruptionRepairTools~VFP -Freeware: -ATFixDbfFpt -Dbfix -CMrepair http://www.cmstory.com/_cm/CMrepair.zip -Kommerziell: -StoneField http://www.stonefield.com/sdt.html -FoxFix http://www.xitech-europe.co.uk/ -dSalvage http://www.dsalvage.com/ -RECOVER 4.0 http://www.abri.com/recover.html Verweiß auf Freeware-Tools zum Anzeigen von Tabellen: -DBFView 2.03 http://www.dbfview.com/ -HiBase 2000 v1.36 http://hibase.virtualave.net/ -DBF Viewer 2000 1.89 http://www.dbf2002.com/ -VFPView 3.2 http://milan.jikos.cz/main.html -DBFRead 1.23 http://www.alxsoft.narod.ru/ -DBFNavigator 2.01 http://www.alxsoft.narod.ru/ -DBF-Editor 1.20 http://www.dbf-editor.com/ -dbEdit 3.4 http://www.arachnoid.com/dbedit/ -DBViewZusatztool für den Total-Commander -CDBFVIEW 1.10Plugin für den Total-Commander DBF´s reparieren leicht gemacht von Wolfgang Pasler und Hans-Peter Grözinger (das Schwabenteam) Stand 12.01.04Seite 8/8 Zusammenfassung Es ist gar nicht so schwer, defekte DBF-Tabellen zu reparieren, wenn man: -eine Sicherung hat -das richtige Werkzeug -mit kurzen Feldnamen (maximal 10 Zeichen) tut man sich wesentlich leichter. -nichts ist unmöglich -schwieriger wird´s mit DBT/FPT-Tabellen Wie immer gibt´s das Ganze von: http://www.schwaben-team.de/downloads/dfpug/dbfrepair/dbfrepair.zip.
Load more

Recommended publications
  • Xbase++ Language Concepts for Newbies Geek Gatherings Roger Donnay
    Xbase++ Language Concepts for Newbies Geek Gatherings Roger Donnay Introduction Xbase++ has extended the capabilities of the language beyond what is available in FoxPro and Clipper. For FoxPro developers and Clipper developers who are new to Xbase++, there are new variable types and language concepts that can enhance the programmer's ability to create more powerful and more supportable applications. The flexibility of the Xbase++ language is what makes it possible to create libraries of functions that can be used dynamically across multiple applications. The preprocessor, code blocks, ragged arrays and objects combine to give the programmer the ability to create their own language of commands and functions and all the advantages of a 4th generation language. This session will also show how these language concepts can be employed to create 3rd party add-on products to Xbase++ that will integrate seamlessly into Xbase++ applications. The Xbase++ language in incredibly robust and it could take years to understand most of its capabilities, however when migrating Clipper and FoxPro applications, it is not necessary to know all of this. I have aided many Clipper and FoxPro developers with the migration process over the years and I have found that only a basic introduction to the following concepts are necessary to get off to a great start: * The Xbase++ Project. Creation of EXEs and DLLs. * The compiler, linker and project builder . * Console mode for quick migration of Clipper and Fox 2.6 apps. * INIT and EXIT procedures, DBESYS, APPSYS and MAIN. * The DBE (Database engine) * LOCALS, STATICS, PRIVATE and PUBLIC variables. * STATIC functions.
    [Show full text]
  • Dbase Plus 1 Table Designer Behavior
    User’s Guide VERSION 7.5 release 2.61 for Windows® 98, 2000, NT ME and XP dataBased Intelligence, Inc. Vestal, NY http://www.dbase.com news://news.dbase.com dataBased Intelligence, Inc. or Borland International may have patents and/or pending patent applications covering subject matter in this document. The furnishing of this document does not give you any license to these patents. COPYRIGHT © 2006 dataBased Intelligence, Inc. All rights reserved. All dBASE product names are trademarks or registered trademarks of dataBased Intelligence, Inc. All Borland product names are trademarks or registered trademarks of Borland International, Inc. Other brand and product names are trademarks or registered trademarks of their respective holders. Printed in the U.S.A. Contents Chapter 1 Source Editor behavior . .10 Introduction to dBASE Plus 1 Table Designer behavior . .11 Optimized ReportViewer . .11 Welcome to dBASE Plus !. 1 Overview of dBASE Plus version 2.5. .11 What is dBASE Plus? . 1 Mouse events . .11 dBASE Newsgroups . 2 Grid Class . .11 The dBASE Plus Knowledgebase: . 2 Project Explorer . .11 Changes from earlier versions . 2 TreeView. .12 Visual dBase 5.x through Visual dBase 7.0 . 2 Array Class . .12 Report objects and the integrated Report designer . 3 Report . .12 Project Explorer . 3 Inspector . .12 Data objects. 3 _app Object . .12 Visual designers . 3 _app.frameWin . .12 ActiveX integration. 4 Procedure files . .12 The Inspector . 4 Report Designer . .12 Full-featured Source editor . 4 Error Handling. .12 SQL designer . 4 CHOOSEPRINTER( ) and choosePrinter( ) . .13 BDE Administrator and database support . 4 Overview of dBASE Plus version 2.6 . .13 DBF7 file format features .
    [Show full text]
  • Quick Recovery for Dbase
    QUICK RECOVERY FOR DBASE QUICK RECOVERY FOR DBASE Operation steps Who Suffers most Features 100% data recovery is possible if Recovery Modes Frequently asked Questions © Unistal Systems Pvt. Ltd., New Delhi Quick Recovery for Dbase Quick Recovery for Dbase recovers corrupted Dbase (Database) files which get corrupted due to unexpected software crash, unexpected system shutdown, virus attacks or error reading media where documents are stored. It is a professional file repair tool to repair corrupt FoxPro databases, dBase database file. During repairing process a complete scan of the damaged database is performed to locate and extract the recoverable information from the database. After complete scanning, the database contents which are recoverable are shown in the preview window. You can then easily save the recovered results as a working dbf database file. Its unique Guided File Excavation Technology (GFETch) helps in locating files and folders lost behind overwritten partitions too. FEATURES Quick and Automated Analysis with Simple & Well guided steps to recover & repair DBF files Recovers deleted DBF files from crashed & formatted HDD Repairs Corrupt DBF table Repair .DBF files with memo or binary data fields stored in DBT files. Support for batch repairing of DBF files All recovery cases possible that have been experienced by Unistal have been incorporated All recovery cases possible that have been experienced by Unistal have been incorporated Unique Guided File Excavation Technology (GFETch) used 100% data recovery and repair is possible if; Files are accidentally deleted. Header or footer is corrupted File summary, user or track information is corrupted internal links are Intact © Unistal Systems Pvt.
    [Show full text]
  • Compatible with the World
    EN DE FR NL IT PsiWin 2 Supported Applications Windows compatibility? No need to worry. PsiWin 2 ensures that your Series 5 handheld computer integrates seamlessly with leading Windows programs. See the chart below, for details. compatible with the world Synchronizes with Psion Series 5 Agenda, and Data (for contacts) Office 97 Word 97 (8.0) SmartSuite Organizer 97 WordPerfect WordPerfect 8.0 Excel 97 (8.0) 97 Suite 8 Quattro Pro 8.0 Outlook 97 Office 95 / Word 95 (7.0) SmartSuite Organizer 2.1 Office WordPerfect 7.0 Pro Excel 95 (7.0) 96 / Professional 7 Quattro Pro 7.0 Schedule+ 7/7a NotesSuite / WordPerfect (.WB3) Access 95 (Pro 96 Suite 7 version) Office 4.2 / Word 6.0 SmartSuite Organizer 2.1 Office for WordPerfect 7.0 4.3 (Pro) Excel 5.0 4.0 Windows NT Quattro Pro 7.0 FoxPro 2.6 (Pro Server 4.0 (.WB3) version) Office 3.0 Word 2.0 SmartSuite Ami Pro 3.0 WordPerfect WordPerfect 6.1 Excel 4.0 3.0 / 3.1 Organizer 2.1 Suite / Office Quattro Pro 6.0 (3.1 version) Professional / (.WB2) Windows 3.1x Client Software Other Works 3.0 (word Other 1-2-3 WK1 Other WordPerfect 5.1 Applications processor) Applications 1-2-3 WK3 Applications WordPerfect 5.2 Works 4.0 (word 1-2-3 WK4 WordPerfect processor) 6.0a FoxPro 2.0, 2.5, 2.6 Quattro Pro 5.0 (.WB1) Text Rich Text Format(RTF) Database Borland Int. dBASE III, IV, 5.0 Text for Windows Comma Separated Values MS Text for MS DOS DOS Pictures Series 5 Sketch to/from Windows Sound Series 5 Record (uncompressed) BMP to/from Windows WAV Synchronizes with Psion Series 5 Agenda, and Data (for contacts) Two way exchange Word If you have Lotus SmartSuite 97 you can open and save previous Sheet versions of SmartSuite applications' files, which are Psion compatible.
    [Show full text]
  • R&R Report Writer Version 9.0, Xbase & SQL Editions New Release
    R&R Report Writer Version 9.0, xBase & SQL Editions New Release Enhancements and New Capabilities Liveware Publishing is pleased to announce an exciting set of enhancements to R&R Report Writer!! This is the first MAJOR update to R&R in almost five years, but Liveware has made up for lost time with substantial improvements for every R&R user. Developers building reports for their applications, end-users creating their own ad-hoc and production reports, and even casual R&R runtime users will all find something in this release to streamline their reporting activities. For those who have purchased and implemented every update, and particularly Liveware’s Version 8.1 release licensees, you will be rewarded for your loyalty with a reduced upgrade price and a wide range of capabilities that will make R&R even more indispensable. For others who waited, this is the upgrade to buy since it contains so many unique and compelling ideas about reporting -- and ones you can use right away!! Version 9.0 includes 5 new “modules” -- what we consider significant extensions of R&R capabilities -- and many convenience and usability improvements to open reporting to database users at all levels. The 5 new modules are (with page number in parenthesis): Email Report Bursting & Distribution (2) Report Librariantm (4) ParameteRRtm Field Prompting (9) FlexLinktm Indexing-on-the-fly (11) Rapid Runnertm Runtime Control (16) Among the other improvements, the most significant are: Pervasive Band Color-coding (18) Page X of Y Functions (20) Redesigned Table Join Dialog (21) Print Preview Band Identification (23) Drill-down in Result Set Browser (24) Visual dBase 7 Support (25) This document will summarize each of these modules and improvements and describe how they expand R&R’s capabilities to an ever-wider range of reporting needs.
    [Show full text]
  • Automating the Archives: a Case Study
    364 American Archivist / Vol. 57 / Spring 1994 Downloaded from http://meridian.allenpress.com/american-archivist/article-pdf/57/2/364/2748641/aarc_57_2_9p4t712558174274.pdf by guest on 25 September 2021 Automating the Archives: A Case Study CAROLE PRIETTO Abstract: The establishment of an archival automation program requires that the archivist address issues of both a technical and a managerial nature. These issues include needs assessment, selection of hardware and software to meet identified needs, redesigning ar- chival tasks in light of the system selected, and ongoing maintenance of the system se- lected. The present article discusses the issues Washington University Archives staff members faced in developing an automation program and the solutions they adopted. It concludes with a brief discussion of possible future directions for the automation program. About the author: Carole Prietto holds a B.A. in history from the University of California at Santa Barbara and an M.A. in history from UCLA. From 1986 to 1989 she was the assistant in the UCLA University Archives; since 1990, she has been university archivist at Washington University, St. Louis. Automating the Archives: A Case Study 365 MUCH DISCUSSION IN THE LITERATURE Washington University Archives. This pro- about archival automation concerns imple- cess consisted of a number of steps over a mentation of the USMARC AMC format three-year period: evaluating the existing and development of national descriptive hardware and software, selecting a new da- 1 4 standards. This discussion is both useful tabase management package, installing Downloaded from http://meridian.allenpress.com/american-archivist/article-pdf/57/2/364/2748641/aarc_57_2_9p4t712558174274.pdf by guest on 25 September 2021 and necessary, but it examines only one and setting up the new software and train- side of the automation issues archivists ing staff in its use, adding OCLC and NO- face.
    [Show full text]
  • Unit 6: Computer Software
    Computer Software Unit 6: Computer Software Introduction Collectively computer programs are known as computer software. This unit consisting of four lessons presents different aspects of computer software. Lesson 1 introduces software and its classification, system software which assists the users to develop programs for solving user problems is presented in Lesson 2. Many programs for widely used applications are available commercially. These programs are popularly known as application packages or package programs or simply packages. Advantages of package programs and brief outline of popular packages for word-processing, spreadsheet analysis, database management systems, desktop publication and graphic and applications are discussed in Lesson 3. Tasks for developing computer programs and brief introduction to some common programming languages are presented in Lesson 4. Lesson 1: Introduction and Classification 1.1 Learning Objectives On completion of this lesson you will be able to • understand the concept of software • distinguish between system software and application software • know components of system software and types of application software. 1.2 Software Software of a computer system is intangible rather than physical. It is the term used for any type of program. Software consists of statements, which instruct a computer to perform the required task. Without software a computer is simply a mass of electronic components. For a computer to input, store, make decisions, arithmetically manipulate and Software consists of output data in the correct sequence it must have access to appropriate statements, which instruct programs. Thus, the software includes all the activities associated with a computer to perform the required task. the successful development and operation of the computing system other than the hardware pieces.
    [Show full text]
  • “Not Only Microsoft: the Maturing of the Personal Computer Software
    Martin Campbell-Kelly Not Only Microsoft: The Maturing of the Personal Computer Software Industry, 1982-1995 In the thirteen years following the introduction of IBM's first personal computer in 1982, Microsoft rose from being a small concern to become the colossus of the PC software industry. However, Microsoft was not the only software company to profit from the PC-software boom: firms like AutoDesk, Lotus Development, WordPerfect Corp., Ashton-Tate, Novell, Borland, Adobe Systems, Aldus, Symantec, and the Santa Cruz Operation all had their time in the sun. Whereas some of these firms lost their markets to Microsoft or stumbled through strategic errors, others remained hugely successful, and their relative obscurity is largely due to the contemporary obsession with Microsoft and its billionaire founder. he early history of the personal computer is well known. It has fea- Ttured in the press, in numerous popular histories of computing, and in television programs such as Robert X. Cringley's "Triumph of the Nerds."1 Within the business history community, the story is known at a deeper level, partly through the inevitable osmosis that ac- companies the daily use of a personal computer, but also through arti- cles such as Richard Langlois's study of the microcomputer industry, MARTIN CAMPBELL-KELLY is a reader in computer science at the University of War- wick, England. My work on the history of the software industry has been supported by the Economic and Social Research Council (award number R000237065). I would like to thank my research as- sociates at Warwick University, Dr. Mary G. Croarken and Dr.
    [Show full text]
  • Visual DBU O Softseek On/Off O Rushmore Filter Technic On/Off O Smartfilter On/Off Administration of O Incremental Search On/Off
    Settings: o display of deleted records on/off o display of century on/off Visual DBU o softseek on/off o Rushmore filter technic on/off o Smartfilter on/off Administration of o incremental search on/off. If a keystroke is done during displaying a data browse, a search ensues Data Tables with the entered key o quickedit on/off, a keystroke opens at once the edit mode of cell o directedit on/off, if the edit of a cell is finished the cursor jumps to the next cell and continues the edit Visual DBU is a tool for administration of data process tables / databases. It was developed with o cell preview on/off, if the cell contents does not fit Xbase++ of Alaska Software Inc. and the libraries into the cell's width, it will displayed as tooltip XClass++ and AdsClass++ . o global setting for font and color o default database driver and file extension Range of functions: Administration: available in German and English language o setting user grants opening by drag&drop possible o registration of additional DLLs with user specific maintenance of table structure and indexes enhancements (Xbase++ DLL) supports OEM (DOS) and ANSI (Windows) character Visual DBU can be used in two different ways: set MDI Splitter constructions of relations setting of filter and scopes Sum() and Count() evaluations incremental search and locate SQL query dialog data-import and –export cross over different table formats with filter and field assignment individual design of data columns save and restore of views with filter, indexes, relations repository for free tables, ADS, ODBC and PostgreSQL user administration with grants Supported data formats and databases: Desktop mode o Dbase DBF / NTX with DBT o Dbase DBF / CDX with FPT o FoxPro DBF up from vVer.
    [Show full text]
  • Clipper Programming Language
    Clipper Programming Language From Wikipedia, the free encyclopedia.(*) Clipper (or CA-Clipper) is a compiler 16 bits of language xBase environment for DOS . It was created in 1984 with the purpose of being a compiler for Ashton-Tate dBase , a database manager very popular in his time. This is a derivation of the Clipper Summer and after being acquired by Computer Associates reached version 5.3b implemented by a graphical interface compatible with the MS-Windows 3.11, and for a subset of supported languages C and assembly , which made possible a prototype of Object Orientation . When Computer Associates stopped support this language, it was intended for application development platforms for MS-DOS and offered libraries for network support. Why make use of a standard language originally developed by Ashton Tate and operating systems from existing CP/M , has a very different syntax of the languages most current. In his day, was considered an elegant and intuitive language, using small verbs and abbreviations, symbols and structuring. Their compilers generate executable which in 2008 would be considered tiny, extremely fast and, for most users, with a little friendly interface. Again, in his time, was one of the most versatile and enabled the creation of fully integrated systems with images, sounds and video, and has already used the concepts of hyperlink (via standard RTF ), context help and instantiating objects (although primitives, via Code Blocks), which, except for the C language, has only been achieved years later by the competition. Another important feature was the inclusion of Rushmore, now owned by Microsoft , indexing tables for your data, making it one of the languages better performances in this area.
    [Show full text]
  • Dbase Plus 1 Table Designer Behavior
    User’s Guide VERSION 7.5 release 2.5 for Windows® 95, 98, 2000 NT, ME and XP dataBased Intelligence, Inc. Vestal, NY http://www.dbase.com news://news.dbase.com dataBased Intelligence, Inc. or Borland International may have patents and/or pending patent applications covering subject matter in this document. The furnishing of this document does not give you any license to these patents. COPYRIGHT © 2002 dataBased Intelligence, Inc. All rights reserved. All dBASE product names are trademarks or registered trademarks of dataBased Intelligence, Inc. All Borland product names are trademarks or registered trademarks of Borland International, Inc. Other brand and product names are trademarks or registered trademarks of their respective holders. Printed in the U.S.A. Contents Chapter 1 Source Editor behavior . .11 Introduction to dBASE Plus 1 Table Designer behavior . .11 Optimized ReportViewer . .11 Welcome to dBASE Plus !. 1 Overview of dBASE Plus version 2.50 . .11 What is dBASE Plus? . 1 Mouse events . .11 dBASE Newsgroups . 2 Grid Class . .11 The dBASE Plus Knowledgebase: . 2 Project Explorer . .12 Changes from earlier versions . 2 TreeView. .12 Visual dBase 5.x through Visual dBase 7.0 . 2 Array Class . .12 Report objects and the integrated Report designer . 3 Report . .12 Project Explorer . 3 Inspector . .12 Data objects. 3 _app Object . .12 Visual designers . 3 _app.frameWin . .12 ActiveX integration. 4 Procedure files . .13 The Inspector . 4 Report Designer . .13 Full-featured Source editor . 4 Error Handling. .13 SQL designer . 4 CHOOSEPRINTER( ) and choosePrinter( ) . .13 BDE Administrator and database support . 4 dBASE Plus documentation . .13 DBF7 file format features .
    [Show full text]
  • Don Maslin CP/M Collection
    http://oac.cdlib.org/findaid/ark:/13030/c8ws90bd No online items Guide to the Don Maslin CP/M collection Finding aid prepared by Rita Wang and Sydney Gulbronson Olson, 2017. Elena Colón-Marrero, and Pennington Ahlstrand, 2020. Processing of this collection was made possible through generous funding from the National Archives' National Historical Publications & Records Commission: Access to Historical Records grant. Computer History Museum 1401 N. Shoreline Blvd. Mountain View, CA, 94043 (650) 810-1010 [email protected] August 2020 Guide to the Don Maslin CP/M X6817.2013 1 collection Title: Don Maslin CP/M collection Identifier/Call Number: X6817.2013 Contributing Institution: Computer History Museum Language of Material: English Physical Description: 29.5 Linear feet,19 record carts, 6 software boxes, and 1 periodical box Date (bulk): Bulk, 1977-1984 Date (inclusive): 1973-1996 Abstract: The Don Maslin CP/M collection consists of software and published documentation ranging from 1973 to 1996, with the bulk being from 1977 to 1984. About half of the collection consists of software in floppy disk and cassette formats. Most of this portion of the collection pertains to CP/M and applications that were written for the CP/M operating system. The other half of the collection contains text documentation such as reference manuals and user guides for a variety of software and hardware. A significant portion of the text is related to hardware, some of which was donated with this collection and is cataloged separately. Notable companies in this collection include Advanced Computer Design, Advanced Digital Corporation, Epson, Hewlett-Packard, IBM, MicroPro, and Tektronix.
    [Show full text]